• 340 views | 9 messages Discussion: LEAP
    Topic: Energy system optimization with NEMO HIGHS not workingSubscribe | Previous | Next
  • Alebachew Azezew Belete 10/21/2024

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    Dear all,

    My LEAP optimization model in combination with NEMO was working and I was analyzing results but now it is not working, it says the problem is infeasible. For more clarity, see the screenshot message. Thank you
    NEMO-HIGHS ERRRORS.PNG
  • Taylor Binnington 10/21/2024
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    Hi Alebachew -

    An optimization problem is "infeasible" if no solution exists that satisfies all constraints.

    If the problem occurred after a change you made to your model, I recommend you roll back to the last version you were able to solve, and implement your changes one-by-one to better understand the effects they have on the feasibility of a problem. If the problem instead occurred after you changed versions of LEAP (or NEMO) but you made no further changes to your model, please let us know the version of both LEAP and NEMO that you are using.

    Thanks,
    Taylor
  • Alebachew Azezew Belete 10/21/2024
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    Dear Taylor,

    Thank you very much for your immediate response and nice feedback. The problem occurred after changing to LEAP 2024.1.1.6 and NEMO 2.1. I think Especially, changing LEAP 2024.1.1.6. Not only one of my models, but all other LEAP Models are also showing the same problem as, the previously attached one, for whole energy system optimization optimization. If possible, I will attach the file. In addition, I didn't solve the attached one, it always appears but the model works.
  • Alebachew Azezew Belete 10/21/2024
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    Dear Taylor,

    Thank you very much for your immediate response and nice feedback. The problem occurred after changing to LEAP 2024.1.1.6 and NEMO 2.1. I think Especially, changing LEAP 2024.1.1.6. Not only one of my models, but all other LEAP Models are also showing the same problem as, the previously attached one, for whole energy system optimization optimization. If possible, I will attach the file. In addition, I didn't solve the attached one, it always appears but the model works, shown below.
    Error.PNG
  • Alebachew Azezew Belete 10/22/2024
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    Dear Taylor, excuse me for wrongly stating the occurrence of the issue, I realized that it was working after updating LEAP 2024.1.1.6 and NEMO 2.1, so I didn't get what caused the problem. The problem is when I am running full energy optimization of the model. Thank you


    Alebachew
  • Taylor Binnington 10/24/2024
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    Thanks Alebachew - I'll look into this.

    Taylor
  • Alebachew Azezew Belete 10/25/2024
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    Dear Taylor,

    Thank you for your immediate response.

    Alebachew
  • Alebachew Azezew Belete 10/31/2024
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    Dear LEAP TEAM,

    This is to inform you that, the new version LEAP2024.1.1.9 solved the issue of energy system optimization occurred in my LEAP model as i posted a week before. Thank you very much for your immediate solution.

    Regards,

    Alebachew
  • Charlie Heaps 11/6/2024
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    Great - thanks for letting me know!